The ornamental design for a bicyclestand, as shown and described.
FIG. 1 is a top, front, and right side perspective view of a bicycle stand showing my new design, the broken-line end portions and second half of the assembly are for illustrative purposes only and form no part of the claimed design, and the broken-line disclosure of the four vertical elements is understood to indicate indeterminate length;
FIG. 2 is a right side elevational view thereof, the left side being a mirror image of that shown;
FIG. 3 is a front elevational view thereof, the rear being a mirror image of that shown; and,